"電波計時台"應該不是啥新玩意, 廠商資料 其原理是接收無線電時號(radio Time signal), 維基百科。 二十年前(戒嚴年代),第一次接觸到短波收音機是在天文觀測的實習,助教拿出政府許可擁有的德國戈蘭蒂的短波收音機接收無線電時號。
事實上,只要連結到外部標準時間來源者都可,以下節自維基百科
Radio-controlled movements Some electronic quartz watches are able to synchronize (time transfer) themselves with an external time source. These sources include radio time signals directly driven by atomic clocks, time signals from GPS navigation satellites, the German DCF77 signal in Europe, WWVB in the US, and others. These watches are free-running most of the time, but periodically align themselves with the chosen external time source automatically, typically once a day.